<template>
<div>
     <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片试图区域-->
    <el-card>
        <!--警告区域-->
     <el-alert show-icon
    title="注意：只允许第三级分类设置相关的参数"
    type="warning" :closable="false">
     </el-alert>
      <!--选择商品分类区域-->
     <el-row class="cat_opt">
         <el-col>
             <span>选择商品分类</span>
             <!--选择商品分类的级联选择框-->
    <el-cascader class="el-cascader-menu" expand-Trigger="hover"
    :options="catelist"
    :props="cateProps"
    v-model="selectedCateKeys"
    @change="handleChange">
    </el-cascader>
         </el-col>
     </el-row>
      <!--tab页签区域-->
     <el-tabs v-model="activeName" @tab-click="handleTabClick">
    <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
         <!--动态参数表格-->
         <el-table :data="manyTableDate" border stripe>
             <!--展开行-->
              <el-table-column type="expand">
                  <template slot-scope="scope">
                      <!--循环渲染tag标签-->
                    <el-tag v-for="(item,i) in scope.row.attr_vals"
                    :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!--输入文本框-->
                    <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                     ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)">
                     </el-input>
                     <!--添加的按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
             </el-table-column> 
             <!--索引列-->
            <el-table-column type="index"></el-table-column>  
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
         </el-table>
    </el-tab-pane>
    <el-tab-pane label="静态属性" name="only">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
         <!--静态属性表格-->
         <el-table :data="onlyTableDate" border stripe>
              <!--展开行-->
              <el-table-column type="expand">
                  <template slot-scope="scope">
                      <!--循环渲染tag标签-->
                    <el-tag v-for="(item,i) in scope.row.attr_vals"
                    :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <!--输入文本框-->
                    <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                     ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)">
                     </el-input>
                     <!--添加的按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
             </el-table-column> 
             <!--索引列-->
            <el-table-column type="index"></el-table-column>  
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
         </el-table>
    </el-tab-pane>
  </el-tabs>
    </el-card>
 <!--添加参数对话框-->
    <el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
       <!--添加参数对话框d的表单-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
       <el-form-item :label="titleText" prop="attr_name">
       <el-input v-model="addForm.attr_name"></el-input>
       </el-form-item>
        </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

 <!--修改参数对话框-->
    <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
       <!--添加参数对话框d的表单-->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
       <el-form-item :label="titleText" prop="attr_name">
       <el-input v-model="editForm.attr_name"></el-input>
       </el-form-item>
        </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
</div>
</template>
<script>
export default {
    data(){
        return{
            //商品分类列表
           catelist:[],
           //级联选择框的配置对象
           cateProps:{
             value:'cat_id',
             label:'cat_name',
             children:'children'
           },
           //级联选择框的双向绑定的数组
           selectedCateKeys:[],
           //被激活的页签名称
           activeName:'many',
           //动态参数列表
           manyTableDate:[],
           //静态属性列表数据
           onlyTableDate:[],
           //控制添加对话框的显示与隐藏
           addDialogVisible:false,
           //添加表单参数的数据对象
           addForm:{
               attr_name:''
           },
           //添加表单参数的数据的验证规则
           addFormRules:{
               attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
               ]
           },
           editDialogVisible:false,
           editForm:{   
               attr_name:''
           },
           editFormRules:{
               attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
               ]
           },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类列表
     async getCateList(){
           const{data:res}=await this.$http.get('categories')
           if(res.meta.status!==200){
               return this.$message.error('获取商品列表失败')
           }
             this.catelist=res.data
             console.log(this.catelist)
      },
      //级联选择项变化，会触发这个函数
       handleChange(){
        this.getParamsData()
      },
       //tab页签点击事件的处理函数
      handleTabClick(){
             console.log(this.activeName)
              this.getParamsData()
      },
      //获取参数列表的参数数据
     async getParamsData(){
         //证明选中的不是三级分类
         if(this.selectedCateKeys.length!==3){
             this.selectedCateKeys=[]
             this.manyTableDate=[]
             this.onlyTableDate=[]

             return
         }
         //证明选中的时三级分类
         console.log(this.selectedCateKeys)
         //根据所选的分类id，和当前所处的面板，获取参数
        const{data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
           
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框输入的值
                item.inputValue=''
            })
             console.log(res.data)
            if(this.activeName==='many'){
                this.manyTableDate=res.data
            }
            else{
                this.onlyTableDate=res.data
            }
      },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
          this.$refs.addFormRef.validate(async valid=>{
              if(!valid) return
               const {data:res}= await this.$http.post(`categories/${this.cateId}/attributes`,{
              attr_name:this.addForm.attr_name,
              attr_sel:this.activeName
          })
         
            if(res.meta.status!==201){
                return $message.error('添加参数失败')
            }
            this.$message.success('添加参数成功')
            this.addDialogVisible=false
            this.getParamsData()
                 })
      },
      //点击按钮，展示修改的对话框
     async showEditDialog(attr_id){
          //查询当前参数的id
           const{data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                 params:{attr_sel:this.activeName}
             })
             if(res.meta.status!==200){
                 return this.$message.error('获取参数信息失败')
             }
                this.editForm=res.data
                this.editDialogVisible=true
      },
      editDialogClosed(){
          this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改参数
      editParams(){
           this.$refs.editFormRef.validate(async valid=>{
               if(!valid) return
              const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
               {attr_name:this.editForm.attr_name,attr_sel:this.activeName})

               if(res.meta.status!==200){
                    return this.$message.error('修改参数信息失败')
               }
               this.$message.success('修改参数信息成功')
               this.getParamsData()
               this.editDialogVisible=false
           })
      },
   //根据id删除对应的参数
   async removeParams(attr_id){
          const confirmResult= await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        //用户取消了删除的操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已经取消删除')
        }
        //删除参数的业务逻辑
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            return this.$message.error('删除参数失败')
        }
             this.$message.success('参数删除成功')
             this.getParamsData()
      },
      //文本框失去焦点或按下enter键都会触发
      async handleInputConfirm(row){
          if(row.inputValue.trim().length===0){
              row.inputValue=''
              row.inputVisible=false
              return
          }
          //如果没有return,则证明输入的内容，与要做后续处理
           row.attr_vals.push(row.inputValue.trim())
           row.inputValue=''
           row.inputVisible=false
           //需要发起请求保存到数据库中
           this.saveAttrVals(row)
      },
           //需要发起请求保存到数据库中
     async  saveAttrVals(row){
                const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
               attr_name:row.attr_name,attr_sel:row.attr_sel,
               attr_vals:row.attr_vals.join(' ')
               })
           if(res.meta.status!==200){
               return this.$message.error('保存数据失败')
                 }
                this.$message.success('保存数据成功')
               },
      //点击按钮，展示文本输入框
      showInput(row){
               row.inputVisible=true
               //让文本框自动获得焦点
               this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数可选项
          handleClose(i,row){
          row.attr_vals.splice(i,1)
             this.saveAttrVals(row)
          }
      
    },
    computed:{
        //如果属性需要被禁用，返回true,否则返回false
        isBtnDisabled(){
       if(this.selectedCateKeys.length!==3){
           return true
       }
       return false
        },
        //当前选中的三级分类的id
        cateId(){
           if(this.selectedCateKeys.length===3){
               return this.selectedCateKeys[2]
           } 
           return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
               return '动态参数' 
            }
            return '静态属性'
        },
      
    }
    
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin-top:15px;
}
.input-new-tag{
    width:120px;
}
</style>